Old Irish bones may yield murderous secrets in Pa

Young and strapping, the 57 Irish immigrants began grueling work in the summer of 1832 on the Philadelphia and Columbia railroad. Within weeks, all were dead of cholera.

Or were they murdered?

Two skulls unearthed at a probable mass grave near Philadelphia this month showed signs of violence, including a possible bullet hole. Another pair of skulls found earlier at the woodsy site also displayed traumas, seeming to confirm the suspicions of two historians leading the archaeological dig....